Unified treatment of perturbed series, continuous spectra and collisions*†

摘要: The properties of entire spectra—specifically, the line positions and transition probabilities perturbed series their adjoining continua as well autoionization profiles related collision cross sections—have been interpreted in terms a few parameters, such quantum defects oscillator-strength densities, which vary slowly with excitation energy. By use Seaton’s quantum-defect theory, concept separate configurations is replaced by more comprehensive channels. Alternative sets channels are considered, frame transformation whose construction main goal analysis each spectrum. Concepts procedures employed for these purposes since 1969 summarized restated here. Reference made to extension treatment negative ions, direct ab initio calculation channel parameters be compared experimental results. Illustrative results presented, guide relevant literature.